package test;

public class CountLettersInArray {
	/** Main method */
	public static void main(String args[]) {
		// Declare and create an array
		char[] chars = createArray();
	 
		// Display the array
		System.out.println("The lowercase letters are:");
		displayArray(chars);
	
		// Count the occurrences of each letter
		int[] counts = countLetters(chars);
	
		// Display counts
		System.out.println();
		System.out.println("The occurrences of each letter are:");
		displayCounts(counts);
	}
	
	/** Create an array of characters */
	public static char[] createArray() {
		// Declare an array of characters and create it
		char[] chars = new char[100];
	
		// Create lowercase letters randomly and assign
		// them to the array
		for (int i = 0; i < chars.length; i++) 
			chars[i] = RandomCharacter.getRandomLowerCaseLetter();
	
		// Return the array
		return chars;
	} 
	
	/** Display the array of characters */
	public static void displayArray(char[] chars) {
		// Display the characters in the array 20 on each line
		for (int i = 0; i < chars.length; i++) {
			if ((i + 1) % 20 == 0)
				System.out.println(chars[i] + " ");
			else
	    	   System.out.print(chars[i] + " ");
		}
	}
	
	/** Count the occurrences of each letter */
	public static int[] countLetters(char[] chars) {
		// Declare and create an array of 26 int
		int[] counts = new int[26];
	
		// For each lowercase letter in the array, count it
		for (int i = 0; i < chars.length; i++) 
			counts[chars[i] - 'a']++;
	
		return counts;
	}
	
	/** Display counts */
	public static void displayCounts(int[] counts) {
		for (int i = 0; i < counts.length; i++) {
			if ((i + 1) % 10 == 0)
				System.out.println(counts[i] + " " + (char)(i + 'a'));
			else
				System.out.print(counts[i] + " " + (char)(i + 'a') + " ");
		}
	}
}



